The present disclosure relates to a wireless communication system. More specifically, the present disclosure relates to: a method for transmitting a physical random access channel (PRACH) in at least one carrier from among a first carrier group on the basis of a channel sensing result, receiving a random access response (RAR) in at least one carrier from among a second carrier group in response to the transmission of the PRACH, and transmitting a physical uplink shared channel (PUSCH) on the basis of the RAR; and an apparatus therefor.
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3. The method of claim 1, wherein the first channel sensing is performed on the sub-band with a highest reference signal received power (RSRP) for a synchronization signal block (SSB).
4. The method of claim 1, wherein the sub-band is a subband related to a lowest energy detection (ED) level based on the channel sensing or the sub-band that has a PRACH transmission time closest to a channel sensing time.
5. The method of claim 1, wherein the RAR is received on at least one sub-band in a BWP that is identical to the BWP.
6. The method of claim 1, wherein the RAR is received on at least one sub-band in a BWP that is different from the BWP.
7. A non-transitory medium which is readable by a processor and storing instructions cause the processor to perform the method of claim 1.
12. The device of claim 10, wherein the first channel sensing is performed on the sub-band with a highest reference signal received power (RSRP) for a synchronization signal block (SSB).
13. The device of claim 10, wherein the sub-band is a subband related to a lowest energy detection (ED) level based on the channel sensing or the sub-band that has a PRACH transmission time closest to a channel sensing time.
A wireless communication device includes a channel sensing module that monitors one or more sub-bands of a frequency spectrum to detect energy levels. The device also includes a random access channel (PRACH) transmission module that selects a sub-band for PRACH transmission based on the channel sensing results. The selection is made by either choosing the sub-band with the lowest detected energy level or the sub-band whose PRACH transmission time is closest to the channel sensing time. This approach optimizes PRACH transmission by reducing interference and improving efficiency in shared spectrum environments, such as those used in cognitive radio or dynamic spectrum access systems. The device may further include a controller that coordinates the channel sensing and PRACH transmission processes, ensuring timely and accurate sub-band selection. The system is particularly useful in scenarios where spectrum availability is dynamic, and efficient use of available sub-bands is critical for reliable communication.
14. The device of claim 10, wherein the RAR is received on at least one sub-band in a BWP that is identical to the BWP.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
April 5, 2019
November 15, 2022
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